Exercise can combat cognitive decline, according to the results of a new study. Older adults who did high amounts of moderate-to-vigorous physical activity had a 36 percent lower risk of cognitive impairment, as well as better memory and executive function, than those who did less. In the study, published in the journal Medicine & Science in Sports & Exercise, researchers outfitted 6,400 people older than 65 years old with an activity tracker for a week. more